铅离子印迹电化学传感器的制备及其性能

Preparation of Lead Ion-Imprinted Electrochemical Sensor and Its Performance

以Pb2+为模板离子、吡咯(Py)为功能单体,在还原氧化石墨烯银纳米复合材料(rGO-AgNPs)修饰的电极表面直接构建铅离子印迹电化学传感器(Pb^2+-IIES),用于水环境中重金属离子的检测与分离。通过Fourier变换红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)对复合材料进行分析表征,并利用循环伏安法(CV)、交流阻抗法(EIS)对电化学传感器的性能进行表征。结果表明,在5. 0×10^-9~5. 0×10^-5mol·L^-1范围内,Pb^2+-IIES响应电流与Pb2+浓度的负对数呈现良好的线性关系,检出限为5. 0×10^-11 mol·L^-1(S/N=3),可用于水环境中Pb^2+的痕量检测。

A novel lead ion-imprinted electrochemical sensor(Pb^2+-IIES) based on reduced graphene oxide-silver nanocomposite(rGO-AgNPs) was prepared for efficient separation and determination of lead ions in water environment, Pb^2+as the template ion,pyrrole(Py) as the functional monomer. The structures of rGO-AgNPs were characterized by Fourier transform infrared(FT-IR)spectrometer, X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The performance of Pb^2+-IIES was investigated by using cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS)in details. Under the optimized conditions,a linear relationship exists between the response currents of the Pb^2+-IIES and the negative logarithm of Pb2+concentrations ranging from 5.0×10^-9-5.0×10^-5 mol · L^-1, with the detection limit of 5.0×10^-11 mol ·L^-1(S/N=3) for Pb2+, which can be used for the trace detection of Pb2+in water environment.